FBReader is an e-book reader application that is capable of opening both DRM-free e-books and those protected by Readium LCP. This versatility allows users to access a wide range of reading materials without being constrained by restrictive digital rights management. Among the primary formats that FBReader supports are ePub, including essential features of ePub3, PDF documents, and Kindle azw3 format as well as the older Mobipocket format. Additionally, it can accommodate various other formats like comic books in CBZ/CBR, RTF, Microsoft Word documents, HTML files, and plain text documents, making it a comprehensive solution for diverse reading preferences.
One of the standout features of FBReader is its dictionary integration, which aids users in reading books in foreign languages. This functionality allows readers to look up words or phrases quickly, enhancing understanding and fluency. Users have access to a vast array of external dictionaries, facilitating a smoother reading experience and making it easier for language learners to immerse themselves in foreign literature.
FBReader also offers a unique synchronization feature that allows users to sync their library and reading positions using the FBReader book network, a cloud service based on Google Drive. While this synchronization option is disabled by default, users can easily enable it through the preferences dialogue, providing a way to maintain continuity in their reading across different devices. This is particularly useful for those who frequently switch between devices for their reading activities.
In terms of customization and usability, FBReader is designed to be both fast and adaptable to individual user preferences. It supports external TrueType and OpenType fonts, allows users to set custom backgrounds, and provides screen brightness adjustment features for comfortable reading in various lighting conditions. Users can also choose from different color schemes suitable for day or night reading. Moreover, FBReader includes a built-in browser and downloader for accessing online e-book catalogs and stores, and it supports custom OPDS catalogs, further enhancing accessibility to a wide array of reading material. With localization available in 34 languages and hyphenation patterns for 24 of them, FBReader truly accommodates a global audience of readers.